cc: Change required_for_activation bookkeeping.

cc/layers/picture_layer_impl.h

Index: cc/layers/picture_layer_impl.h
diff --git a/cc/layers/picture_layer_impl.h b/cc/layers/picture_layer_impl.h
index cd7c68b32a42bec85d1f868f4d0c1c153e577cf3..44b417cbfa109cb9e437eab35ddb9b2f6f4772b7 100644
--- a/cc/layers/picture_layer_impl.h
+++ b/cc/layers/picture_layer_impl.h
@@ -92,6 +92,7 @@ class CC_EXPORT PictureLayerImpl
   virtual void AppendQuads(QuadSink* quad_sink,
                            AppendQuadsData* append_quads_data) OVERRIDE;
   virtual void UpdateTilePriorities() OVERRIDE;
+  virtual void NotifyTileInitialized(const Tile* tile) OVERRIDE;
   virtual void DidBecomeActive() OVERRIDE;
   virtual void DidBeginTracing() OVERRIDE;
   virtual void ReleaseResources() OVERRIDE;
@@ -139,6 +140,14 @@ class CC_EXPORT PictureLayerImpl
   WhichTree GetTree() const;
   bool IsOnActiveOrPendingTree() const;
 
+  // Return the count of tiles on this layer that meet both of the following
+  // conditions:
+  // 1. The tile is required for activation.
+  // 2. The tile needs rasterization (ie, it's not ready to draw).
+  size_t TilesRequiredForActivationThatNeedsRasterCount() const {

[reveman, 2014/04/25 22:23:59]

Sorry, term "Initialized" or "ReadyToDraw" is probably better here than "Raster"
as we use those already. ie. NotifyTileInitialized.

UninitializedTilesRequiredForActivationCount?

[vmpstr, 2014/04/25 23:16:15]

Makes sense. Done.

+    return required_for_activation_tile_needs_raster_count_;
+  }
+
  protected:
   friend class LayerRasterTileIterator;
 
@@ -162,13 +171,13 @@ class CC_EXPORT PictureLayerImpl
   float SnappedContentsScale(float new_contents_scale);
   void UpdateLCDTextStatus(bool new_status);
   void ResetRasterScale();
-  void MarkVisibleResourcesAsRequired() const;
+  void MarkVisibleResourcesAsRequired();
   bool MarkVisibleTilesAsRequired(
       PictureLayerTiling* tiling,
       const PictureLayerTiling* optional_twin_tiling,
       float contents_scale,
       const gfx::Rect& rect,
-      const Region& missing_region) const;
+      const Region& missing_region);
 
   void DoPostCommitInitializationIfNeeded() {
     if (needs_post_commit_initialization_)
@@ -220,6 +229,8 @@ class CC_EXPORT PictureLayerImpl
   gfx::Size viewport_size_for_tile_priority_;
   gfx::Transform screen_space_transform_for_tile_priority_;
 
+  size_t required_for_activation_tile_needs_raster_count_;
+
   friend class PictureLayer;
   DISALLOW_COPY_AND_ASSIGN(PictureLayerImpl);
 };